Arrangement for starting internal-combustion engines.



H. LENTZ.

ARRANGEMENT FOR STARTING INTERNAL COMBUSTION ENGINES.

y APPLICATION FILED JUNE 3. 1915. LWL-48h PatentedAug. 24, 1915.

Jn V672 tor 1 aM" gwn-u@ ATM/msm HUGO LENTZ, 0F BERLIN-HALENSEE, GERMANY.

ARRANGEMENT FOR STARTING INTERNAL-COMBUSTION EGINES.

Specification of Letters Patent.

Patented Aug. 24, 1915.

Application filed June 3, 1915. Serial No. 32,002.

'a new and useful Improvement in Arrangements for Starting Internal-Combustion Engines, of which the following is a spec1- iication.

My invention relates to a novel arrange-v ment for starting internal combustion engines by the intermediary of a hydraulic gear controlling at the same time the speed of the shaft to be driven, and is characterized in that the pumping motors of the gear are arranged in groups to suit the number of the internal combustion engines connected therewith, and that one of the sets of pumps driven at the beginning drives the remaining sets of pumps together with the internal. combustion engines connected therewith, whereupon as soon as the said additional internal combustion engines are normally running the sets of pumps are connected with the set of motors of the gear, the latter then acting as a mere transmission gear between the power engines and the shaft to be driven.

In the accompanying drawings the invention is illustrated by way of example.

Figure l shows the arrangement diagrammatically.v Fig. 2 is a longitudinal section through the gear, and Figs. 3. and 4( are transverse sections according to the lines A B and C D, respectively, of Fig. 2.

According to Fig. l two separate groups a, Z) of internal combustion engines (such as Diesel-motors) act by means of the shafts a', ZJ respectively, upon a hydraulic gear c, which may consist, for instance, of valveless pumps made, as shown, like a Iwell-known form of blower with radially adjustable blades. Said. gear is driving a third shaft c. The saidhydraulic gear comprises two sets of pumps (Z, e which are driven independently of one another by the combustion engines (l, Z) coupled with them. Preferably engines (z, b and pumps (Z, e, driven by same, of such power are used that the group o, e shall have twice the output of the other group (L, (Z. The set of motors of the gear driven by one of the sets of pumps, or by both sets, transmits its motion to the shaft c to be driven, which is coupled with'the said set ofmotors.

Aswill be seen from Figs. 2 to 4, in the form of construction illustrated the pumps (Z, e and the set of motors f are arranged in thesame casing c with their axes parallel to one another. The working chambers cZ, e of the pumps are on one side connected by a passage r/ with ,the working chamber of the set of motors, and communicate on the other side with a chamber it with which also'the chamber f is in open connection. ln the pressure and suction passages thus formed, controlling valves Zr., le and Z, Z, respectively, are disposed in immediate proximity to the sets of pumps. The said valves consist ot t'wo parts to suit the two part set of pumps (Z, e, the parts f, Z controlling the fluid-passage to the pump (Z, while the parts c, Z control the corresponding passage to the pump e. According to the position of the said parts the working chambers (Z, e communicate with the working chamber f of the set of motors or with the chamber h. Besides the passages de-l scribed, there are by-pass conduits m disposed laterally in the casing, and being in communication with a chamber 71, arranged under the controlling members Z, Z and extending the whole length thereof.

The operation of the arrangement is as follows: At the state of rest all the valves are open toward the chamber Z1., the sets of pumps thus being in immediate connection. Inthis position the smaller power engine a may be started in any knownA manner, for instance, by means of compressed air. It', now, merely the valves k, Z are caused to assume the position shown in Fig'. 8, the set of motors f is driven and the shaft c is rotated at low'speed. To cut in the larger power engine Z) all that it is necessary to do is to bring the valves c, Z in the position represented in Fig. 4t. Then a part of the pressure liquid from the pump (Z flows through the passage m into the chamber n, and from there to the working chamber e of the pumps e to drive same,

whereupon the liquid fluid returns through the chamber it to the suction chamber of the pump (Z. By the admission of the second pump the second power engine is started. This being done, the normal combustion working may begin, the valves c, Z will in such case be adjusted to the same position in which the valves 7c, Z in Fig. 3 are' shown. Then also the second pump is driving the set of motors, so that the latter is rotated at high speed. The different speeds of the shaft c to be driven may be attained in the manner usual with gears of this kind.

The arrangement may, however, be used in such a way thatl with the state of rest not the set ofmotors f is moved at the beginning but the pump d is used directly for Starting the larger power engine. To such end the valves are initially brought to assume the position shown in Figs. 3 and 4. The resistance of the set of motors being very great in such case, the whole pressure liquid will be conducted through the' passage fm, and the chamber' n to the second pump e so that the second power engine will be started.

Owing to this novel starting arrangement the compressed air plant hereto-forenecessary for the larger power eng-ine may be dispensed with. This is most advantageous especially in case the arrangement is employed in connection with means for driving vehicles, locomotives and vships by the intermediary of internal ycombustion engines,

f as the available space is very small in such events. The invention, furthermore, enables a number of independent power engines to act upon a joint gear, as they may act upon the shaft to-be driven without respect to their diiferent outputs.

Instead of two groups of internal combustion engines a suitable number thereof may act upon a gear; in such case the sets of pumps must be accordingly constructed and arranged. With the 4-i'orm of construction shown each set of machines drives one pump made in one part. The pump in connection vwith a set of machines may, however, be

made in several parts, whereby a greater -number of different speeds is to be attained.

The sets of pumps and the set of motors may be single or double-acting. It is also to be understood that Amy invention is not limited to the construction shown in the drawing, and that various changes may be made in the general arrangement and construction of the parts without departing from the invention.

I claim herein as my invention:

`1. In an arrangement for starting internal combustion engines, in combination, a hydraulic transmission gear the 'pumping motors of which are subdivided to'suit thck number of attached combustion engines,y

means for driving one of such sets of pumps, means, acted upon by this set of pumps, for driving the other set of pumps and the combustion engines attached to them, and means for connecting the said sets of pumps to the set of motors of the said hydraulic gear.

2. In an arrangement for starting internal combustion engines, in combination, a hydraulic transmission gear the pumping motors of which are subdivided to suit the number of attached combustion engines, means for driving one of such sets of pumps, by-pass channels extending between the pressure chamber of this set of pumps and the suction chamber of another of the said sets of pumps, and valves for controlling such by-pass channels, substantially as set forth.

In testimony whereof I aHiX my signature in presence of two witnesses.

HUGO LENTZ.

Witnesses HENRY HAsPER, WOLDEMAR HAUPT. 

